Lex 3I380A/CW (Atom E3845) motherboards are equipped with dual Intel I211
based 1Gbps copper ethernet:

     http://www.lex.com.tw/products/pdf/3I380A&3I380CW.pdf

This patch is to fix the issue with broken "LAN2" port. Before the
patch, only one ethernet port is initialized:

     igb 0000:01:00.0: added PHC on eth0
     igb 0000:01:00.0: Intel(R) Gigabit Ethernet Network Connection
     igb 0000:01:00.0: eth0: (PCIe:2.5Gb/s:Width x1) 4c:02:89:10:02:e4
     igb 0000:01:00.0: eth0: PBA No: FFFFFF-0FF
     igb 0000:01:00.0: Using MSI-X interrupts. 2 rx queue(s), 2 tx queue(s)
     igb: probe of 0000:02:00.0 failed with error -2

With this patch, both ethernet ports are available:

     igb 0000:01:00.0: added PHC on eth0
     igb 0000:01:00.0: Intel(R) Gigabit Ethernet Network Connection
     igb 0000:01:00.0: eth0: (PCIe:2.5Gb/s:Width x1) 4c:02:89:10:02:e4
     igb 0000:01:00.0: eth0: PBA No: FFFFFF-0FF
     igb 0000:01:00.0: Using MSI-X interrupts. 2 rx queue(s), 2 tx queue(s)
     igb 0000:02:00.0: added PHC on eth1
     igb 0000:02:00.0: Intel(R) Gigabit Ethernet Network Connection
     igb 0000:02:00.0: eth1: (PCIe:2.5Gb/s:Width x1) 4c:02:89:10:02:e5
     igb 0000:02:00.0: eth1: PBA No: FFFFFF-0FF
     igb 0000:02:00.0: Using MSI-X interrupts. 2 rx queue(s), 2 tx queue(s)

The issue was observed at 3I380A board with BIOS version "A4 01/15/2016"
and 3I380CW board with BIOS version "A3 09/29/2014".

Reference: https://lore.kernel.org/netdev/08c744e6-385b-8fcf-ecdf-1292b5869f94@redhat.com/ (local)
Fixes: 648e921888ad ("clk: x86: Stop marking clocks as CLK_IS_CRITICAL")
Cc: <redacted> # v4.19+
Signed-off-by: Matwey V. Kornilov <redacted>
---
 drivers/platform/x86/pmc_atom.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/platform/x86/pmc_atom.c b/drivers/platform/x86/pmc_atom.c
index b8b1ed1406de..5dc82667907b 100644
--- a/drivers/platform/x86/pmc_atom.c
+++ b/drivers/platform/x86/pmc_atom.c

@@ -388,6 +388,24 @@ static const struct dmi_system_id critclk_systems[] = {
 			DMI_MATCH(DMI_PRODUCT_NAME, "CEC10 Family"),
 		},
 	},
+	{
+		/* pmc_plt_clk* - are used for ethernet controllers */
+		.ident = "Lex 3I380A",
+		.callback = dmi_callback,
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Lex BayTrail"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "3I380A"),
+		},
+	},
+	{
+		/* pmc_plt_clk* - are used for ethernet controllers */
+		.ident = "Lex 3I380CW",
+		.callback = dmi_callback,
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Lex BayTrail"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "3I380CW"),
+		},
+	},
 	{
 		/* pmc_plt_clk0 - 3 are used for the 4 ethernet controllers */
 		.ident = "Lex 3I380D",

-- 
2.35.3